參照：

您好，
我在BOD(Brown-out Detection)時發現PIC18F242有以下幾個參數有相關:

Reset Control REGISTER(RCON)的BOR
BOR: Brown-out Reset Status bit
1 = A Brown-out Reset has not occurred
0 = A Brown-out Reset occurred
(must be set in software after a Brown-out Reset occurs)


CONFIGURATION REGISTER 2 LOW(CONFIG2L)的BOREN及BORV1

bit 3-2 BORV1:BORV0: Brown-out Reset Voltage bits
11 = VBOR set to 2.5V
10 = VBOR set to 2.7V
01 = VBOR set to 4.2V
00 = VBOR set to 4.5V

bit 1 BOREN: Brown-out Reset Enable bit
1 = Brown-out Reset enabled
0 = Brown-out Reset disabled

如您所說的BOD開啟是否啟動就能避免程式出現亂跑現象(異常寫入或清除資料)，所以我BOREN設定為1即可，BORV1則自行斟酌靈敏度，
還是必須配合BOR去檢測掉電時相應措施，可能是EBTRB、CPB和WRTB防止寫入的機制呢?
不好意思是新手，所以問題多一些，謝謝



CONFIGURATION REGISTER 7 HIGH (CONFIG7H)的EBTRB
bit 6 EBTRB: Boot Block Table Read Protection bit
1 = Boot Block (000000-0001FFh) not protected from Table Reads executed in other blocks
0 = Boot Block (000000-0001FFh) protected from Table Reads executed in other blocks

CONFIGURATION REGISTER 5 HIGH (CONFIG5H)的CPB
bit 6 CPB: Boot Block Code Protection bit
1 = Boot Block (000000-0001FFh) not code protected
0 = Boot Block (000000-0001FFh) code protected

CONFIGURATION REGISTER 6 HIGH (CONFIG6H)的WRTB

bit 6 WRTB: Boot Block Write Protection bit
1 = Boot Block (000000-0001FFh) not write protected
0 = Boot Block (000000-0001FFh) write protected

了解，謝謝您，我再檢查一下。

各位先進您好，
我在使用PIC18F242時，遇到了燒錄完後，在關電放置約1週以上再上電時Boot block可能被清除4行(被清除的位置都一樣)，
在重新燒錄後依舊可正常使用，這個情況大概1000片PCB有5片發生過，但是做連續上電及關電的測試10000次也沒有發生(5秒開，5秒關)，
不曉得各位先進是否有問到過這種問題，有可能是PIC18F242內部機制錯誤清除資料呢?

:020000040000FA
:10000000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF00
:10001000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF0
:10002000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFE0
:10003000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFD0
:1000400000000000000000000000000000000000B0
:100050001200DACFE4FFE2CFDAFFE9CFE4FFEACF24
:10006000E4FFF6CFE4FFF7CFE4FFF5CFE4FFF3CFF3